Where does “краи” come from?
краи (Old Church Slavonic) comes from Proto-Slavic krajь, from Proto-Slavic krojiti, from Proto-Balto-Slavic krájīˀtei, from Proto-Indo-European kroyh₁-eye-ti, from Proto-Indo-European kroyh₁-, from Proto-Indo-European kroh₁y-, from Proto-Indo-European kreh₁y- — to sift, to separate.
краи (Old Church Slavonic): edge; end; rim
Ancestry of “краи”, step by step